void usbuart_init(void) { UART_PIN_SETUP(); periph_clock_enable(USBUART_CLK); __asm__("nop"); __asm__("nop"); __asm__("nop"); uart_disable(USBUART); /* Setup UART parameters. */ uart_clock_from_sysclk(USBUART); uart_set_baudrate(USBUART, 38400); uart_set_databits(USBUART, 8); uart_set_stopbits(USBUART, 1); uart_set_parity(USBUART, UART_PARITY_NONE); // Enable FIFO uart_enable_fifo(USBUART); // Set FIFO interrupt trigger levels to 1/8 full for RX buffer and // 7/8 empty (1/8 full) for TX buffer uart_set_fifo_trigger_levels(USBUART, UART_FIFO_RX_TRIG_1_8, UART_FIFO_TX_TRIG_7_8); uart_clear_interrupt_flag(USBUART, UART_INT_RX | UART_INT_RT); /* Enable interrupts */ uart_enable_interrupts(UART0, UART_INT_RX| UART_INT_RT); /* Finally enable the USART. */ uart_enable(USBUART); //nvic_set_priority(USBUSART_IRQ, IRQ_PRI_USBUSART); nvic_enable_irq(USBUART_IRQ); }
void usbuart_init(void) { #if defined(BLACKMAGIC) /* On mini hardware, UART and SWD share connector pins. * Don't enable UART if we're being debugged. */ if ((platform_hwversion() == 1) && (SCS_DEMCR & SCS_DEMCR_TRCENA)) return; #endif rcc_peripheral_enable_clock(&USBUSART_APB_ENR, USBUSART_CLK_ENABLE); UART_PIN_SETUP(); /* Setup UART parameters. */ usart_set_baudrate(USBUSART, 38400); usart_set_databits(USBUSART, 8); usart_set_stopbits(USBUSART, USART_STOPBITS_1); usart_set_mode(USBUSART, USART_MODE_TX_RX); usart_set_parity(USBUSART, USART_PARITY_NONE); usart_set_flow_control(USBUSART, USART_FLOWCONTROL_NONE); /* Finally enable the USART. */ usart_enable(USBUSART); /* Enable interrupts */ USBUSART_CR1 |= USART_CR1_RXNEIE; nvic_set_priority(USBUSART_IRQ, IRQ_PRI_USBUSART); nvic_enable_irq(USBUSART_IRQ); /* Setup timer for running deferred FIFO processing */ USBUSART_TIM_CLK_EN(); timer_reset(USBUSART_TIM); timer_set_mode(USBUSART_TIM, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP); timer_set_prescaler(USBUSART_TIM, rcc_ppre2_frequency / USBUART_TIMER_FREQ_HZ * 2 - 1); timer_set_period(USBUSART_TIM, USBUART_TIMER_FREQ_HZ / USBUART_RUN_FREQ_HZ - 1); /* Setup update interrupt in NVIC */ nvic_set_priority(USBUSART_TIM_IRQ, IRQ_PRI_USBUSART_TIM); nvic_enable_irq(USBUSART_TIM_IRQ); /* turn the timer on */ timer_enable_counter(USBUSART_TIM); }